/Engine/Source/Runtime/Engine/Public/SceneManagement.h
bool GetVirtualTextureLightmapProducer ( [ERHIFeatureLevel::Type](API\Runtime\RHI\ERHIFeatureLevel__Type) FeatureLevel, [FVirtualTextureProducerHandle](API\Runtime\RenderCore\FVirtualTextureProducerHandle) & OutProducerHandle )